176 lines
5.3 KiB
C++
176 lines
5.3 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <functional>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MachineX86_64.h>
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#include <unwindstack/MapInfo.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/RegsX86_64.h>
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#include <unwindstack/UcontextX86_64.h>
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#include <unwindstack/UserX86_64.h>
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namespace unwindstack {
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RegsX86_64::RegsX86_64() : RegsImpl<uint64_t>(X86_64_REG_LAST, Location(LOCATION_SP_OFFSET, -8)) {}
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ArchEnum RegsX86_64::Arch() {
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return ARCH_X86_64;
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}
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uint64_t RegsX86_64::pc() {
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return regs_[X86_64_REG_PC];
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}
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uint64_t RegsX86_64::sp() {
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return regs_[X86_64_REG_SP];
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}
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void RegsX86_64::set_pc(uint64_t pc) {
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regs_[X86_64_REG_PC] = pc;
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}
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void RegsX86_64::set_sp(uint64_t sp) {
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regs_[X86_64_REG_SP] = sp;
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}
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uint64_t RegsX86_64::GetPcAdjustment(uint64_t rel_pc, Elf*) {
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if (rel_pc == 0) {
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return 0;
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}
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return 1;
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}
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bool RegsX86_64::SetPcFromReturnAddress(Memory* process_memory) {
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// Attempt to get the return address from the top of the stack.
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uint64_t new_pc;
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if (!process_memory->ReadFully(regs_[X86_64_REG_SP], &new_pc, sizeof(new_pc)) ||
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new_pc == regs_[X86_64_REG_PC]) {
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return false;
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}
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regs_[X86_64_REG_PC] = new_pc;
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return true;
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}
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void RegsX86_64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
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fn("rax", regs_[X86_64_REG_RAX]);
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fn("rbx", regs_[X86_64_REG_RBX]);
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fn("rcx", regs_[X86_64_REG_RCX]);
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fn("rdx", regs_[X86_64_REG_RDX]);
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fn("r8", regs_[X86_64_REG_R8]);
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fn("r9", regs_[X86_64_REG_R9]);
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fn("r10", regs_[X86_64_REG_R10]);
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fn("r11", regs_[X86_64_REG_R11]);
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fn("r12", regs_[X86_64_REG_R12]);
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fn("r13", regs_[X86_64_REG_R13]);
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fn("r14", regs_[X86_64_REG_R14]);
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fn("r15", regs_[X86_64_REG_R15]);
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fn("rdi", regs_[X86_64_REG_RDI]);
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fn("rsi", regs_[X86_64_REG_RSI]);
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fn("rbp", regs_[X86_64_REG_RBP]);
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fn("rsp", regs_[X86_64_REG_RSP]);
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fn("rip", regs_[X86_64_REG_RIP]);
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}
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Regs* RegsX86_64::Read(void* remote_data) {
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x86_64_user_regs* user = reinterpret_cast<x86_64_user_regs*>(remote_data);
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RegsX86_64* regs = new RegsX86_64();
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(*regs)[X86_64_REG_RAX] = user->rax;
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(*regs)[X86_64_REG_RBX] = user->rbx;
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(*regs)[X86_64_REG_RCX] = user->rcx;
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(*regs)[X86_64_REG_RDX] = user->rdx;
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(*regs)[X86_64_REG_R8] = user->r8;
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(*regs)[X86_64_REG_R9] = user->r9;
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(*regs)[X86_64_REG_R10] = user->r10;
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(*regs)[X86_64_REG_R11] = user->r11;
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(*regs)[X86_64_REG_R12] = user->r12;
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(*regs)[X86_64_REG_R13] = user->r13;
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(*regs)[X86_64_REG_R14] = user->r14;
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(*regs)[X86_64_REG_R15] = user->r15;
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(*regs)[X86_64_REG_RDI] = user->rdi;
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(*regs)[X86_64_REG_RSI] = user->rsi;
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(*regs)[X86_64_REG_RBP] = user->rbp;
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(*regs)[X86_64_REG_RSP] = user->rsp;
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(*regs)[X86_64_REG_RIP] = user->rip;
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return regs;
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}
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void RegsX86_64::SetFromUcontext(x86_64_ucontext_t* ucontext) {
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// R8-R15
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memcpy(®s_[X86_64_REG_R8], &ucontext->uc_mcontext.r8, 8 * sizeof(uint64_t));
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// Rest of the registers.
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regs_[X86_64_REG_RDI] = ucontext->uc_mcontext.rdi;
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regs_[X86_64_REG_RSI] = ucontext->uc_mcontext.rsi;
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regs_[X86_64_REG_RBP] = ucontext->uc_mcontext.rbp;
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regs_[X86_64_REG_RBX] = ucontext->uc_mcontext.rbx;
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regs_[X86_64_REG_RDX] = ucontext->uc_mcontext.rdx;
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regs_[X86_64_REG_RAX] = ucontext->uc_mcontext.rax;
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regs_[X86_64_REG_RCX] = ucontext->uc_mcontext.rcx;
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regs_[X86_64_REG_RSP] = ucontext->uc_mcontext.rsp;
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regs_[X86_64_REG_RIP] = ucontext->uc_mcontext.rip;
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}
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Regs* RegsX86_64::CreateFromUcontext(void* ucontext) {
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x86_64_ucontext_t* x86_64_ucontext = reinterpret_cast<x86_64_ucontext_t*>(ucontext);
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RegsX86_64* regs = new RegsX86_64();
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regs->SetFromUcontext(x86_64_ucontext);
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return regs;
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}
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bool RegsX86_64::StepIfSignalHandler(uint64_t rel_pc, Elf* elf, Memory* process_memory) {
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uint64_t data;
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Memory* elf_memory = elf->memory();
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// Read from elf memory since it is usually more expensive to read from
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// process memory.
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if (!elf_memory->ReadFully(rel_pc, &data, sizeof(data)) || data != 0x0f0000000fc0c748) {
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return false;
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}
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uint16_t data2;
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if (!elf_memory->ReadFully(rel_pc + 8, &data2, sizeof(data2)) || data2 != 0x0f05) {
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return false;
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}
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// __restore_rt:
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// 0x48 0xc7 0xc0 0x0f 0x00 0x00 0x00 mov $0xf,%rax
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// 0x0f 0x05 syscall
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// 0x0f nopl 0x0($rax)
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// Read the mcontext data from the stack.
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// sp points to the ucontext data structure, read only the mcontext part.
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x86_64_ucontext_t x86_64_ucontext;
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if (!process_memory->ReadFully(regs_[X86_64_REG_SP] + 0x28, &x86_64_ucontext.uc_mcontext,
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sizeof(x86_64_mcontext_t))) {
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return false;
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}
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SetFromUcontext(&x86_64_ucontext);
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return true;
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}
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Regs* RegsX86_64::Clone() {
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return new RegsX86_64(*this);
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}
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} // namespace unwindstack
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